Robert Plutchik (21 October 1927 – 29 April 2006) was professor emeritus at the Albert Einstein College of Medicine and adjunct professor at the University of South Florida. He received his Ph.D. from Columbia University and he was also a psychologist. He has authored or coauthored more than 260 articles, 45 chapters and eight books and has edited seven books. His research interests include the study of emotions, the study of suicide and violence, and the study of the psychotherapy process.[1]

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Robert Plutchik's psychoevolutionary theory of emotion is one of the most influential classification approaches for general emotional responses. He considered there to be eight primary emotions—anger, fear, sadness, disgust, surprise, anticipation, trust, and joy. Plutchik proposed that these 'basic' emotions are biologically primitive and have evolved in order to increase the reproductive fitness of the animal. Plutchik argues for the primacy of these emotions by showing each to be the trigger of behaviour with high survival value, such as the way fear inspires the fight-or-flight response.

Robert Plutchik also created a wheel of emotions. This wheel is used to illustrate different emotions compelling and nuanced. Plutchik first proposed his cone-shaped model (3D) or the wheel model (2D) in 1980 to describe how emotions were related.

He suggested 8 primary bipolar emotions: joy versus sadness; anger versus fear; trust versus disgust; and surprise versus anticipation. Additionally, his circumplex model makes connections between the idea of an emotion circle and a color wheel. Like colors, primary emotions can be expressed at different intensities and can mix with one another to form different emotions. Criticisms include its lack of "pride" as an emotion, despite listing mild emotions such as distraction, pensiveness, and boredom.

The theory was extended to provide the basis for an explanation for psychological defence mechanisms; Plutchik proposed that eight defense mechanisms were manifestations of the eight core emotions. See defence mechanisms.